It's a shame she didn't go out with you, it seems to me that would be the ultimate in crossdressing, going out with your wife as "girlfriends" and doing normal things two female friends would do.
Ask your wife to help you chose clothing and makeup and maybe at some point she will agree to go out with you, especially if you go out of town where people won't recognize her.
edit: Well there's one thing that comes to mind that might top going out with your wife as girlfriends but I'm going to leave that to the imagination.
